Can you put an RT engine in a SXT?
No—swapping an RT’s 5.7L V8 into a SXT is not a practical, plug‑and‑play upgrade. A true RT engine swap would require extensive changes to the powertrain, electronics, cooling, and chassis, often making it impractical or unfeasible for most owners.
Understanding the SXT and RT lineups
The SXT trim is Mopar’s entry‑level configuration for sedans like the Charger or Challenger, typically paired with a 3.6L Pentastar V6 and an 8‑speed automatic, with depending on year and market, rear‑ or all‑wheel drive. The R/T designation denotes a performance variant that uses a larger V8—the 5.7L Hemi—with greater power and rear‑wheel drive as the standard, though all‑wheel‑drive options exist on some model years. The two trims sit at different points in the lineup in terms of power, driveline options, and targeted use.
Core differences at a glance
Key distinctions include engine displacement and output, exhaust sound and tuning, cam and valve timing, transmission calibration, and the intended balance between daily usability and performance dynamics. The RT’s V8 and supporting hardware are designed around higher heat and load, which changes how the vehicle’s cooling, wiring, and software are configured compared with the SXT.
What a swap would entail
Below is a look at the major subsystems that would need to be addressed if someone attempted to install an RT engine into a SXT. Keep in mind this is a high‑level guide; actual feasibility varies by model year and vehicle architecture.
- Engine and transmission assembly, including mounts and subframe adaptations
- Engine control unit (ECU) and wiring harnesses, plus revised powertrain control modules
- Fuel system changes (pump, lines, injectors, and pressure regulation)
- Cooling system upgrades (radiator, condenser, fans, hoses, and routing)
- Intake and exhaust system rework (manifolds, exhaust routing, catalytic components)
- Drivetrain components (driveshaft or rear differential, and any AWD transfer case if applicable)
- Steering, braking, and stability control integration (pumps, lines, ABS sensors, control modules)
- Instrument cluster and other gauges calibrated for the new engine data
- Emissions controls and regulatory compliance considerations
- Suspension geometry and tuning to manage the added weight and power
- Immobilizer, security systems, and compatibility of aftermarket electronics
In practical terms, this is a multi‑discipline, multi‑month to multi‑year project that involves specialized labor, custom fabrication, and potentially legal hurdles related to emissions and vehicle registration.
In short, this kind of engine swap is rarely feasible or economical for a standard SXT, and most owners are better served by alternative routes to higher performance.
Practical alternatives for RT‑level performance
There are safer, more predictable paths to achieve RT‑level performance without a full engine swap. Consider the following options, evaluated in order of practicality for most owners.
- Trade up to an R/T or another factory‑built performance model with the desired engine from the factory
- Explore factory or dealer performance packages that may be available for your model year (these are designed to be compatible and warrantied)
- Apply non‑engine upgrades that improve performance and handling while keeping the original powertrain intact (tuned engine calibration, intake and exhaust improvements, improved cooling, upgraded exhaust system, performance tires, and suspension/brake upgrades)
- Consult a qualified shop about a controlled, professional crate‑engine swap or integrative powertrain upgrade, understanding it may still face regulatory and warranty considerations
Note that crate engine projects and similar aftermarket substitutions involve substantial engineering work, potential legal hurdles, and may void existing warranties. Always consult with a licensed professional and verify local emissions and inspection requirements before pursuing such work.
Summary
For most SXT owners, moving to an RT engine is not a practical upgrade. The safer and more reliable path to RT‑level performance is to opt for an R/T or other performance‑oriented model, or to pursue carefully planned, compliant enhancements to the existing drivetrain. If your goal is the pure experience of an RT‑powered car, buying the factory option that matches your performance target remains the most sensible route.
What does the SXT stand for?
Standard eXTra
SXT stands for "Standard eXTra". It is the base trim option for the Challenger, Charger, and Durango. Despite being the entry-level trim, the Standard eXTra offers incredible performance and technology.
Is a SXT or GT faster?
No, a GT is not inherently faster than an SXT, as they typically use the same base engine and have the same acceleration times. While some Charger GT models may have a slight horsepower and torque advantage over some SXT models, features on the GT like "sport mode" provide a more responsive and faster-feeling driving experience through adjustments to the suspension, steering, and shift points.
- Same core powertrain: In most cases, the Challenger SXT and GT trims use the same 3.6L V6 engine with identical horsepower and torque ratings, resulting in similar acceleration times and top speeds.
- GT has performance features: The GT trim includes performance-oriented features that make it feel faster. These include sport mode adjustments to the suspension, steering, and transmission, which provide a more aggressive throttle response and quicker shift times.
- GT might have a slight power advantage: Some specific model years may show the GT with slightly more horsepower and torque than the SXT, which could make it technically faster, though the real-world difference is minimal.
- GT has a heavier option: The GT often comes with an all-wheel-drive (AWD) option, which adds weight and can slow it down compared to an RWD SXT.
Can I put a V8 engine in my car?
Yes, you can put a V8 engine in your car, but the difficulty depends heavily on the specific vehicle and engine. Some swaps are relatively straightforward, especially if the car was originally offered with a V8, while others are extremely difficult and require extensive modifications to the frame, suspension, fuel system, and more.
This video shows an example of a V8 engine swap into a car: 59sAutoalex v2YouTube · Nov 8, 2024
Factors to consider
- Car and engine compatibility: Swapping a V8 into a car already built for one, like a Ford Fairmont or Mustang II, is much easier than putting one into a small car designed for a four-cylinder engine. The engine family is also a factor, as V8s from the same family (like Chevy's LS engines) can be easier to swap because they are already popular for this purpose.
- Physical space and weight: A V8 engine is large and heavy, so you must ensure it fits in the engine bay. The increased weight will also put stress on the car's frame and suspension, likely requiring upgrades to the front springs, brakes, and chassis to prevent damage.
- Modifications needed: You will need to replace or modify numerous components, including:
- Engine mounts
- Transmission and exhaust system
- Fuel system
- Cooling system
- Wiring and other electrical components
- Suspension and braking systems
- Skill and resources: V8 swaps are complex projects that require significant fabrication skills, specialized tools, and a large budget. It is not a simple "bolt-in" job, and you must be prepared for a long and challenging process.
Alternatives
- If you want the performance of a V8 but don't want the hassle of a swap, consider buying a V8-equipped car instead.
- Many modern V8 engines are also more powerful, reliable, and fuel-efficient than older ones, making them a great option for restomod projects in older cars.
Is an SXt a V8?
No, the "SXT" trim level in Dodge vehicles is not a V8; it comes with a Pentastar V6 engine. SXT stands for "Standard eXTra" and is the base trim, which is equipped with the V6, while models like the R/T are the V8 options.
This video explains the difference between the V6 Pentastar engine and the V8 Hemi engine: 1mRacerXYouTube · May 24, 2020
- Engine: SXT models use a 3.6-liter Pentastar V6 engine.
- Trim level: It is the entry-level trim for models like the Challenger and Charger.
- V8 models: To get a V8 engine, you would need to choose a higher trim level, such as the R/T.
